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May Weather in Boston, Ireland

Last updated: August 23, 2025

In May, the average temperature in Boston, Ireland is a mild 12°C (53°F). Expect a minimum of 0°C (32°F) and a maximum of 25°C (78°F). With an average humidity of 83%, this month also brings 68 mm (2.7 in) of precipitation spread over 12 days, so be prepared for some rain!

May Temperature in Boston

In May in Boston, the average temperature is 12°C (53°F). The maximum can reach 25°C (78°F), while the minimum can drop as low as 0°C (32°F). This makes it a great time to explore Boston, offering comfortable weather for outdoor activities and sightseeing.

May Weather in Boston: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Boston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Boston, May typically has an average temperature of 12°C (53°F), with highs reaching up to 25°C (78°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec434445485357605956514745
Data source: Temperature data for Boston generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Boston

In Boston in May, the precipitation amount is 68 mm (2.7 in) over the course of 12 days.

May Precipitation Trends in Boston

The chart displays monthly precipitation patterns in Boston, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Boston, May typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec8613811261687684133102121105131
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Boston

In Boston in May humidity is 83%. With an average temperature of 12°C (53°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and necessitating layers to stay comfortable while traveling.

May Average Humidity in Boston

This chart illustrates the average monthly humidity levels in Boston, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Boston is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%86%83%83%85%85%88%91%92%89%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Boston

In Boston in May, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Boston.

Maximum UV Index Levels in Boston for May

The chart shows the monthly maximum UV Index (UVI) for Boston in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Boston typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875321
Data source: Boston May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How May Weather in Boston Compares to Other Months

Weather in Boston varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Boston, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Boston, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (44°F)86 mm (3.4 inches)88%low
February Weather7°C (44°F)138 mm (5.4 inches)88%low
March Weather7°C (45°F)112 mm (4.4 inches)87%moderate
April Weather9°C (49°F)61 mm (2.4 inches)86%moderate
May Weather12°C (53°F)68 mm (2.7 inches)83%high
June Weather14°C (57°F)76 mm (3.0 inches)83%very high
July Weather16°C (60°F)84 mm (3.3 inches)85%very high
August Weather15°C (59°F)133 mm (5.2 inches)85%high
September Weather13°C (56°F)102 mm (4.0 inches)88%moderate
October Weather11°C (52°F)121 mm (4.8 inches)91%moderate
November Weather8°C (47°F)105 mm (4.1 inches)92%low
December Weather7°C (45°F)131 mm (5.2 inches)89%low

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